Birthdays
George Andreas Atzerodt
Turns 28 on this date
Samuel Cooper
Turns 65 on this date
John Hanson McNeil
Turns 48 on this date
David Levy Yulee
Turns 53 on this date
Events
| Battles/Soldiers | Confederate naval units capture the Tacony off the East Coast and convert her into a commerce raider | 06/12/1863 |
| Battles/Soldiers | General Hunter takes his leave after an eventful year as head of the Department of the South | 06/12/1863 |
| Education/Culture | In London, the Arts Club is officially founded at its inaugural General Meeting | 06/12/1863 |
| Battles/Soldiers | In Louisiana, the Siege of Port Hudson continues |
05/28/1863 to 06/13/1863 |
| Battles/Soldiers | In Mississippi, the Siege of Vicksburg continues |
05/26/1863 to 07/03/1863 |
| Business/Industry | In Wisconsin, the Milwaukee and Horicon Railroad is sold at a U.S. Marshal's auction | 06/12/1863 |
| Crime/Disasters | On Lake Michigan, two bodies are found from a Chicago tugboat sinking three weeks before | 06/12/1863 |
| Battles/Soldiers | War Department renames the forts defending Washington DC to honor senior officers killed in the war | 06/12/1863 |
Documents
| Letter | Abraham Lincoln to Erastus Corning and others, June 12, 1863 | 06/12/1863 |
| Military record | General Order of General Darius Couch, Chambersburg, Pennsylvania, June 12, 1863 | 06/12/1863 |
| Executive record | Proclamation by Governor Curtin of Pennsylvania, June 12, 1863 | 06/12/1863 |
| Book | Recollection by Ulysses S. Grant, Siege of Vicksburg, May – July 4, 1863 |
05/25/1863 to 07/04/1863 |